package org.apache.lucene.store;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.io.File;

/**
 * Simple standalone tool that forever acquires & releases a
 * lock using a specific LockFactory.  Run without any args
 * to see usage.
 *
 * @see VerifyingLockFactory
 * @see LockVerifyServer
 */

public class LockStressTest {

    public static void main(String[] args) throws Exception {

        if (args.length != 6) {
            System.out.println("\nUsage: java org.apache.lucene.store.LockStressTest myID verifierHostOrIP verifierPort lockFactoryClassName lockDirName sleepTime\n" + "\n" + "  myID = int from 0 .. 255 (should be unique for test process)\n" + "  verifierHostOrIP = host name or IP address where LockVerifyServer is running\n" + "  verifierPort = port that LockVerifyServer is listening on\n" + "  lockFactoryClassName = primary LockFactory class that we will use\n" + "  lockDirName = path to the lock directory (only set for Simple/NativeFSLockFactory\n" + "  sleepTimeMS = milliseconds to pause betweeen each lock obtain/release\n" + "\n" + "You should run multiple instances of this process, each with its own\n" + "unique ID, and each pointing to the same lock directory, to verify\n" + "that locking is working correctly.\n" + "\n" + "Make sure you are first running LockVerifyServer.\n" + "\n");
            System.exit(1);
        }

        final int myID = Integer.parseInt(args[0]);

        if (myID < 0 || myID > 255) {
            System.out.println("myID must be a unique int 0..255");
            System.exit(1);
        }

        final String verifierHost = args[1];
        final int verifierPort = Integer.parseInt(args[2]);
        final String lockFactoryClassName = args[3];
        final String lockDirName = args[4];
        final int sleepTimeMS = Integer.parseInt(args[5]);

        LockFactory lockFactory;
        try {
            lockFactory = Class.forName(lockFactoryClassName).asSubclass(LockFactory.class).newInstance();
        } catch (IllegalAccessException e) {
            throw new IOException("IllegalAccessException when instantiating LockClass " + lockFactoryClassName);
        } catch (InstantiationException e) {
            throw new IOException("InstantiationException when instantiating LockClass " + lockFactoryClassName);
        } catch (ClassCastException e) {
            throw new IOException("unable to cast LockClass " + lockFactoryClassName + " instance to a LockFactory");
        } catch (ClassNotFoundException e) {
            throw new IOException("unable to find LockClass " + lockFactoryClassName);
        }

        File lockDir = new File(lockDirName);

        if (lockFactory instanceof FSLockFactory) {
            ((FSLockFactory) lockFactory).setLockDir(lockDir);
        }

        lockFactory.setLockPrefix("test");

        LockFactory verifyLF = new VerifyingLockFactory((byte) myID, lockFactory, verifierHost, verifierPort);

        Lock l = verifyLF.makeLock("test.lock");

        while (true) {

            boolean obtained = false;

            try {
                obtained = l.obtain(10);
            } catch (LockObtainFailedException e) {
                System.out.print("x");
            }

            if (obtained) {
                System.out.print("l");
                l.release();
            }
            Thread.sleep(sleepTimeMS);
        }
    }
}
